A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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Secondary peristalsis is a peristaltic contraction of the esophageal circular muscle which begins without swallowing. This secondary wave originates in the esophagus as a result of distension and gives a similar manometric pattern as primary peristalsis.Tertiary waves are defined as contractions which occur simultaneously at different levels of the esophagus [1].his secondary wave originates in the esophagus as a result of distension and gives a similar manometric pattern as primary peristalsis. Tertiary waves are defined as contractions which occur simultaneously at different levels of the esophagus [1].